The video describes mac workstations connecting to a mac server -- but the workstation part in the video (starting at 1:15) is exactly the same as the process we use on our active directory to setup mobile accounts.
Before this will work you will need to 'join' the mac workstations to your SME domain.
and... I've never done this on a SME server, so I don't know that you'll get the 'mobile account' option on your macs after joining them to your SME domain.