NFS isn't SMBFS, I think you're getting the two filesystems confused.
Try:
mkdir -p /mnt/myserver
/bin/mount -t smbfs -o username=,password= "///" /mnt/myserver
Example:
mkdir /mnt/smb
/bin/mount -t smbfs -o username=donkey,password=heehaw "//192.168.1.25/backup" /mnt/smb
When you access /mnt/smb you are looking at \192.168.1.25\backup
Notice the back slashes are replaced with forward slashes.
Hope this helped,
Nathan