As I tried to clarify above, Jens was referring to Couchbase Lite side pull filters (which sometimes gets referred to as import filters). That is completely different than Sync Gateway import filters that you specify in the config file . I explained here what the filters do and what the recommended approach it.
- Use sgw import filters to stop sync to clients . To stop creation of docs on mobile but you can use sync function to reject
 - Channels with sync gateway enforcing access control
 - Channels . More in docs
Couchbase Mobile supports of the fine grained filtering, access control and data routing that you are looking for, Again, I would strongly recommend that you review the documentation links that was shared in my earlier post(s) .
Just wanted to add : we are restructuring the documentation so its bit easier to locate stuff ( menu names are bit more intuitive etc)