OT: Permissions, NAS, Share and symlinks

[David Bovill]

More experiments with my NAS...

My question is regarding SymLinks - or hard links - if I want one directory
to be made available to two different folders with different permissions on
each of the folders - can I use some form of alias - and if so what sort of
permissions would I need on the shared folder? I'm trying to avoid
duplicating data across two different shares.