Sort folders by freshness

Dear LQ,

I would like to sort directories such that the directory containing the freshet files are listed first. For example, if I have three directories A/, B/, C/, the sort would be

Quote:

B/ C/ A/

if B had a file anywhere under its subdirectory tree that is newer than any other file under C and A; and C would have a file anywhere under its subdir tree that is newer than any other file in A's subdir tree.

Any idea how I could do that ?