SMB because I also have macos and windows (well not anymore in fact) clients connecting to it. I could set up a nfs share as well if cifs is not working.
I installed with tce-load -wi filesystems-6.12.25-piCore-v8-16k.tcz (which is my uname -r), I just copy the exact command line because I'm not familiar with tce-load.
rebooted and I still have the same error, cifs filesystem not supported.