recentf-apply-menu-filter

recentf-apply-menu-filter is a compiled Lisp function in `recentf.el'.

(recentf-apply-menu-filter FILTER L)

Apply function FILTER to the list of menu-elements L.
It takes care of sub-menu elements in L and recursively apply FILTER
to them. It is guaranteed that FILTER receives only a list of single
menu-elements (no sub-menu).