Checking vc-state recursively under a directory

[Nordlöw]

Is it somehow possible to check whether all the files under a version-
controlled directory are all up-to-date (updated)? That is like vc-
state() but recursively for a directory?

My reason for asking is that I am writing some emacs lisp snippets
that auto-update-and-rebuild() my Emacs add-ons directly from within
their vc-repositories.

Thanks in advance,
Nordlöw