Remember that a dataset is represented by a physical file on disk, and although the enterprise server can create a default name for the physical file there are various places where you can override this default and specify a name of your own choosing. To specify that a file is to be accessed via Fileshare, you specify the path and filename of the physical file and include in the path the name of the Fileshare server to use.
Wherever you specify the Fileshare server, you precede its name with "$$". For example:
$$server1