I co-founded an ATS company and I can say that we were never asked for, nor provided, any functionality to automatically screen candidates out based on keyword filters (though candidate answers to actual questions like "Do you 5 years experience with node.js?" are often used to automatically screen out).

That said, I have heard this often enough that some people must do it. I can't imagine why though, as it takes only a few seconds for a human to scan a resume. Even at 10 seconds per resume (a conservative estimate), that means the human could screen 360 resumes per hour.