discover source path of a network share

Question

on ClientBox, given an existing D:\foo\bar\, i need to find out whether it's local or remote, and if it's remote, what path it's on the server.

so, if ServerBox shares its F:\public, and ClientBox maps it to D:\, i should get F:\public\foo\bar\.

i want this information to be able to put correct paths into a configuration file.