Amiga netfs is pretty OK for sharing drives between Amigas (or amiga like systems) over TCP/IP connection. Very small, simple to setup, preserves Amiga's file attributes. It feels pretty slow, but does its job very fine otherwise.. although I noticed that it can be fast, but I think that depends how big chunks your copy command tries to transfer. Should make some more tests, but I noticed that with copy command or dopus it's slowish, but with UpDateCopy command it went fast...
Anyway, netfs is provided with all AmiTCP/IP packages (Genesis + older). With those you just need one command line to mount other amiga's partitions. That separate archive can be installed for other TCP/IP stacks.