In your model, the objects that you can filter from coverage recording are:
Simulink® blocks that receive coverage, including MATLAB Function blocks
Subsystems and their contents. When you exclude a subsystem from coverage recording, none of the objects inside the subsystem record coverage.
Individual library-linked blocks or charts
All reference blocks linked to a library
Stateflow® charts, subcharts, states, transitions, and events
For a complete list of model objects that receive coverage, see Model Objects That Receive Coverage.