File sharing only on selected connection type

Dear all

I have a Mac desktop that I routinely connect to my MacBook Pro for file syncing. Obviously I need to have file sharing turned on. Unfortunately when I do this, my Mac desktop appears visible on the wireless network as a shared computer. This makes it insecure (and especially when it shows up as a new Mac Pro, it is tempting to hackers in my large corporate wireless network). In fact, I don't need to connect wirelessly between my desktop and laptop since I use the Thunderbolt bridge. Is there anyway to set my Mac so that file sharing is enabled only on Thunderbolt bridge and not wireless? I know the way to go around this is to enable file sharing only when I do my file syncing, but this would be the last resort. The whole point to doing this is to make things as efficient as possible.