Add more granularity to filter sharing in the REST API by allowing shared permissions to be set.

i.e. If you create a filter (/rest/api/2/filter) it sets the shared permission to the users default sharing permissions. You cannot set the permissions when you create the filter via the API.

You can set the /rest/api/2/filter/defaultShareScope to either Global or Private. Then create the filter which will inherit this permission. However that doesn't allow the granularity to share to specific users/groups ect.