Modify Zsh Configuration to Make M-backspace Remove Last Path Component

[Markus Zeindl <su_ld@xxxxxxxxxxx>]

Hello Zsh-Community,

I've started using zsh on GNU/Linux recently.
When editing commands on the prompt (assumingly in the zle), I
sometimes want to remove the last path component of an entered path
descriptor, i.e. remove the basename of a path. The following
description considers "M" to be the alt-key (or meta-key as in emacs key
notation)

Intuitively, I type M-backspace. This removes the whole path.
Scenario 1 illustrates this. 

Scenario 1: Target: Change directory to /foo/bar/oof/rab
Step 1: type target incorrectly as "% cd /foo/bar/oof/ran"
Step 2: press M-backspace leading to a command-line of "% cd"
Step 3: type target again completely leading to "% cd /foo/bar/oof/rab"

I'm not familiar with Zsh Key notation at all. So, I'm not sure, what
zle-command (or widget?) will be triggered on M-backspace
using the key mapping in Mapping 1. Is it "backward-kill-word"?

Mapping 1: Output of "% bindkey"
"^@" set-mark-command
"^A" beginning-of-line
"^B" backward-char
"^D" delete-char-or-list
"^E" end-of-line
"^F" forward-char
"^G" send-break
"^H" backward-delete-char
"^I" expand-or-complete
"^J" accept-line
"^K" kill-line
"^L" clear-screen
"^M" accept-line
"^N" down-line-or-history
"^O" accept-line-and-down-history
"^P" up-line-or-history
"^Q" push-line
"^R" history-incremental-search-backward
"^S" history-incremental-search-forward
"^T" transpose-chars
"^U" kill-whole-line
"^V" quoted-insert
"^W" backward-kill-word
"^X^B" vi-match-bracket
"^X^F" vi-find-next-char
"^X^J" vi-join
"^X^K" kill-buffer
"^X^N" infer-next-history
"^X^O" overwrite-mode
"^X^U" undo
"^X^V" vi-cmd-mode
"^X^X" exchange-point-and-mark
"^X*" expand-word
"^X=" what-cursor-position
"^XG" list-expand
"^Xg" list-expand
"^Xr" history-incremental-search-backward
"^Xs" history-incremental-search-forward
"^Xu" undo
"^Y" yank
"^[^D" list-choices
"^[^G" send-break
"^[^H" backward-kill-word
"^[^I" self-insert-unmeta
"^[^J" self-insert-unmeta
"^[^L" clear-screen
"^[^M" self-insert-unmeta
"^[^_" copy-prev-word
"^[ " expand-history
"^[!" expand-history
"^[\"" quote-region
"^[\$" spell-word
"^['" quote-line
"^[-" neg-argument
"^[." insert-last-word
"^[0" digit-argument
"^[1" digit-argument
"^[2" digit-argument
"^[3" digit-argument
"^[4" digit-argument
"^[5" digit-argument
"^[6" digit-argument
"^[7" digit-argument
"^[8" digit-argument
"^[9" digit-argument
"^[<" beginning-of-buffer-or-history
"^[>" end-of-buffer-or-history
"^[?" which-command
"^[A" accept-and-hold
"^[B" backward-word
"^[C" capitalize-word
"^[D" kill-word
"^[F" forward-word
"^[G" get-line
"^[H" run-help
"^[L" down-case-word
"^[N" history-search-forward
"^[OA" up-line-or-history
"^[OB" down-line-or-history
"^[OC" forward-char
"^[OD" backward-char
"^[OF" end-of-line
"^[OH" beginning-of-line
"^[P" history-search-backward
"^[Q" push-line
"^[S" spell-word
"^[T" transpose-words
"^[U" up-case-word
"^[W" copy-region-as-kill
"^[[2~" overwrite-mode
"^[[3~" delete-char
"^[[A" up-line-or-history
"^[[B" down-line-or-history
"^[[C" forward-char
"^[[D" backward-char
"^[_" insert-last-word
"^[a" accept-and-hold
"^[b" backward-word
"^[c" capitalize-word
"^[d" kill-word
"^[f" forward-word
"^[g" get-line
"^[h" run-help
"^[l" down-case-word
"^[n" history-search-forward
"^[p" history-search-backward
"^[q" push-line
"^[s" spell-word
"^[t" transpose-words
"^[u" up-case-word
"^[w" copy-region-as-kill
"^[x" execute-named-cmd
"^[y" yank-pop
"^[z" execute-last-named-cmd
"^[|" vi-goto-column
"^[^?" backward-kill-word
"^_" undo
" " magic-space
"!"-";" self-insert
";5C" emacs-forward-word
";5D" emacs-backward-word
"<"-"~" self-insert
"^?" backward-delete-char
"\M-^@"-"\M-." self-insert
"\M-/" complete-word
"\M-0"-"\M-^?" self-insert

How can I modify my configuration to achieve Scenario 2?

Scenario 2: Target: Change directory to /foo/bar/oof/rab
Step 1: type target incorrectly as "% cd /foo/bar/oof/ran"
Step 2: press M-backspace leading to a command-line of 
"% cd /foo/bar/oof/" 
Step 3: type only last path component "rab" again leading to
"cd /foo/bar/oof/rab"

Thanks a lot for every answer, helping me to improve my Zsh-experience.

All The Best,
Markus