I have working Samba on MorphOS 2.
I use Samba 2 68k and modification of ENVARC:sys/net files.
All my MorphOS partitions are shared - read speed 3.5MB/s.

But it's like read-only, very small files can be written to the disk, but "larger" files (>1kB) can't be written - it's weird, maybe Samba config needs to be improved, but I tried everything (smb.conf).