To share the directory, run the Control Panel on QNAP, then select Shared Folders.
Next you have to choose option Create -> Shared Folder, shown in the illustration below.
Create A Shared Folder window will be displayed , where you give a name for the shared folder, then select the folder path and click Create.
In this way the shared folder will be displayed on tree when importing machine in Virtualization Station (installed on the server QNAP).