"Sans Samba ?" It's uses Samba you muppet !
You guys should really reach out and check your sources before posting drivel :-).
This is based on libsmbclient (aka Samba) integrated into ChromeOS.
https://www.samba.org/samba/docs/current/man-html/libsmbclient.7.html
It's not like we're hard to get in touch with..
https://www.samba.org/~jra/