Experiment with editing the /etc/smb.conf file (on linux), for connecting using the GO > Connect to server menu command.
Near the bottom of all the config files I've seen is an example entry you can try - like this:
# The following two entries demonstrate how to share a directory so
# that two users can place files there that will be owned by the
# specific users. In this setup, the directory should be writable by
# both users and should have the sticky bit set on it to prevent abuse.
# Obviously this could be extended to as many users as required.
;[myshare]
; comment = Mary's and Fred's stuff
; path = /usr/somewhere/shared
; valid users = mary fred
; public = no
; writable = yes
; printable = no
; create mask = 0765
Good luck.
