first of all excuse my english :)
Can't rename files using smb:// to access a shared folder because the rename option doesn't appears in contextual menu for files or folders. You can delete, create, copy, etc... but not rename.
Curiously, if you mount the same shared folder (for instance, as cifs in fstab file) and access using the mount point the rename option appears and works. So it happens only when access using smb://.
I'm using same user&password for smb:// and cifs mount.
Thanks and best regards.