If you do an 'ls -l' on the shared directory on the PI you should see some output like:
drwxr-xr-x 3 nana writers 80 2005-09-20 21:37 dir
-rw-r----- 1 nana writers 8187 2005-09-19 13:35 file
-rwxr-xr-x 1 nana writers 10348 2005-07-17 20:31 otherfile
The first block of rwx shows permissions for the owner (nana), the second block of rwx is for the group (writers) and the third block of rwx is for the World. Sorry is this is all well-known to you but the symptoms look like permissions or authentication.
What happens when you do a mount on the VUO? Example below:
mount -t cifs -o username=USERNAME,password=PASSWD //192.168.1.88/shares /mnt/share
Obviously, substitute the PI IP and share name plus your smb user and password.