Are PersistentSubscriptionSettings applied per subscription group or per stream subscription?

Given that when creating subscription using CreateAsync method on EventStorePersistentSubscriptionsClient, one can pass group, stream and PersistentSubscriptionSettings, are settings applied per group or per stream. If I call CreateAsync, by varying stream and settings, but using same group, what will happen? This should be clearly explained in documentation.
Right now I need to write bunch of tests to see what will happen.

The group has one stream and one settings object. You can’t create a group with the same name for another stream. All settings apply to a group, the stream doesn’t know anything about any subscription for that stream, it’s in the group.