If you read SAMBA documentation. It will say put the drivers in
./samba/printers/W32X86 <<-- I think this is for Windows 95, 98, ME
./samba/printers/WIN40 <<-- I think this is for Windows NT
If you want any special settings (color or black and white, dpi, etc) for the printer to be set to all computers on the LAN, all you need to do is add some lines in the inf files.
I haven't got around to do it because my inkjet printers out of alignment.