Request clarification on section 3.5.1.1

[fork03]

There is a point mentioned like Subscriptions are created for a set of paths - which cannot be modified throughout the lifetime of the subscription. In order to cancel a subscription, the client cancels the Subscribe RPC associated with the subscription, or terminates the entire gRPC session.

what does it mean by canceling the subscription, Is it possible to cancel single subscription path in entire grpc session, If yes, please help with some example how to cancel single subscription, in one session