Prevent File Sharing access with Apple ID
Joan, try this (it worked for me):


Log in as a different user than the one you want to modify; also, make sure the account you want to modify is not logged in.
Open the Users &amp; Groups pane of System Preferences.
If the lock icon in the lower-left corner of the Users &amp; Groups window is “locked,” click it and provide an administrative username and password when prompted. This allows you to make changes.
In the list of accounts on the left, right-click (or Control-click) on the name of the account you want to modify, and then choose Advanced Options from the resulting menu.
Look inside the box that says "Aliases".  If your apple ID is listed there, delete it.
Then close the padlock, and that did it for me.  If computers connect via the Apple ID now, all they can see are the shared, public folders. Nothing else.


Hope it works!