Share folder within a folder (permissions)

Lets say I have folder A (the main share) with 10 subfolders. I don't want all users to be able to access all of those subfolders, but I would like specific users to be able to access a one of those subfolders. If I share that subfolder when that users tries to connect to the server I get the prompt to mount the main share/volume and the subfolder share/volume, but it fails. I guess because of the permissions set in folder A (the main share). Is there way to mount that specific volume without giving them access to the main share? Is the only option to move that folder outside folder A?