Hi
I wanted just the same thing, so I tell you what I did.
Downloaded and installed AmiTCP3.3 from Aminet.
Removed all the included NIC drivers.
Installed suitable NIC driver (3c589 in my case - had a problem with this, but thanks to the Author, I received updated version).
Downloaded only smbfs.lha, not the whole samba package.
I observed some strange behaviour of SMBFS (two shares mounted at the same time went wired, too long time idle connection became sort of dead, renaming (moving) files using amiga templates over mounted share doesn't find all the files in one call, but repeting the same over and over again does the trick), but I use it only when I need to transfer files and files transfered are correct. I guess it's much less memory-eating than the whole samba package.
Good luck