It is part of author's Announcment:

This is the first public release of rumba. If you want a short
description of what rumba can do for you: you can mount volumes exported
by Windows or related operating systems on your Unix machine. For a more
detailed description I will quote from the README file:


What does rumba do?
===================
If you know smbfs for Linux: rumba is roughly the same. It is derived
from smbfs, but runs as a user level program, not in the kernel. If you
know samba: rumba is roughly the opposite: a client for the Lanmanager
protocol. If you know neither of these: rumba lets you mount drives
exported by Windows (f.Workgroups/95/NT), Lan Manager, OS/2 etc. on
Unix machines.