Get Incidents, filter by Assigned?

I am trying to filter by user assigned. I am using the incidents operation; getIncidents from the API. I found this in the forum which helped a lot with querying via a time window: 

https://thwack.solarwinds.com/product-forums/solarwinds-service-desk-swsd/f/forum/2638/api---incidents-based-on-created-date-parameters

I see a lot of query parameters being used but not documented nor mentioned here: https://apidoc.samanage.com/

Does anyone have a source? Or is it possible to filter by assigned?

Thank you.