Limit git-stash show to certain pathspec

Question

I want to display a patch for a single file of a certain stash. Usually with git-diff you can append the -- <pathspec> to limit the output.

Now the git-stash manpage states the following for the show command...

By default, the command shows the diffstat, but it will accept
any format known to git diff

... but unfortunately it does not accept a trailing pathspec, so the following command won't work

$ git stash show -p --include-untracked stash@{0} -- test/foo.txt                   
Too many revisions specified: 'stash@{0}' 'test/foo.txt'

The reason I want to use git-stash for this is because it has the --include-untracked option. Is there a way to limit the output to a specific pathspec, or emulate the behavior of

git stash show -p --include-untracked stash@{0}

with a regular git-diff call?