c sharp api query hardwares.owner.id

I have a .net c# web app.  I send api call and can get all of hardwares.json

I want to bring back only data using query for hardwares.owner.id

I am using this syntax  curl /harwares.owner.id=123456  the call goes through but ignores the filter.

The hard part is to query inside of the owner tag.  

Has anyone any suggestions?  

Cindy Mello