Connect to Raspberry Pi Image Samba share

I'm using the Channels DVR Raspberry Pi Image and trying to mount a Samba share on a Mac via the command line without getting prompted for a password.

Is it possible to connect to a Samba share on a Raspberry Pi as a user rather than as Guest? What is the user and password for accessing a Samba share in this environment?

I think I need something like this:

mount -t smbfs //user:password@MyServer/MySambaShare /Volumes/ChannelsSambaShare

How can I do this?

Thanks!
Chris