Finder / Pathfinder - strange file permissions reported

I think I have several issues relating files on my Netgear ReadyNAS.  I think this is caused by permissions issues but I need some advice as to how OS X handles permissions.
As part of my troubleshooting I have checked files using Finder and using Pathfinder.  If I check permissions of a file on my NAS using Finder I see: Owner - (unknown), Group - staff and Everyone. If I check the same file using Pathfinder I see: Owner - markwagstaff (501), staff (20) and Everyone appears in the permissions table. Permissions are the same despite the Owner being unknown using Finder.
If I then copy the file to the desktop and check permissions again Finder and Pathfinder are identical; Finder identifies Owner as markwagstaff (me).
I use the same username to log into the NAS and the Mac (markwagstaff).
Is this behaviour expected? Why is Finder unable to identify the correct Owner name for files on the NAS? What are do the codes reported for owner and group (501) and (20) mean?
Thanks in advance.

More info...
If I check "ignore ownership" on the volume, I can share folders on the volume.  However the permissions set in the sharing control panel are ignored.  Any user can modify (R/W) the shared folder.
If I uncheck "ignore ownership" on the volume, and set the permissions, and "apply to enclosed items", I can no longer share the folder, regardless of the permissions defined in either the sharing control panel, or the folder's get info.
My internal (root) drive has permissions, and sharing works on that volume.  I checked the other USB volume, and it looks like ownership is ignored.
Is this a known issue, that you can't share from a USB drive unless "ignore ownership" is selected?

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