For the client, the GSS EAP mechanism can be specified on the command line:
-smbclient --password samba --mechanism 1.3.6.1.4.1.5322.22.1.18 '\\host\share'".
+smbclient --password samba --mechanism 1.3.6.1.5.5.15.1.1.18 '\\host\share'".
There is no Moonshot SSPI implementation as yet, so it is not possible to test
with a Windows client.