Tag 9: the client ends the FUSE serve; the server answers every ask still open, sends the response finish on the scope, and gives the volume back, and sends nothing on the stop channel itself.
The client opens this channel to end the FUSE serve. The server serves no
ask opened after the stop, answers every ask still open, sends the
response finish on the scope, and gives the volume back.
The request. The tag byte 9 and nothing after it.
Request states its form.
The response. Nothing. Response
states what the server sends instead.