[Samba] Samba perms vs. fs perms

[Steve A]

The subject's a little misleading really, but I was looking for some 
clarification of my thoughts...

In Windows, one can use both share permissions and NTFS permissions to 
control access to files. I would normally use share permissions to control a 
connection (allow/deny), and use NTFS to control access. I would never use 
share permissions to control access whilst NTFS was capable of doing it.

Is this relationship the same for Samba permissions and file system 
permissions? Would you ideally use Samba for connection control, and the 
file system for access control?

If I can sneak a related question in here... I want a 'public' share, with 
only the owner able to modify their own files, do I just use the sticky bit 
filesystem attribute on the public shared directory?

Many thanks,
Steve :)