Ps3 games possible on ps4?

That it does not work with cds I can imagine because ps4 is not backwards compatible, but what about ps3 games from the Psn Store?

I would like to play games like Ratchet, Spyro, Jak & Rayman in chronological order therefore also the question

my pc creates the ps2 emulator, and a ps3 emu is not the question

As far as I know, there are some PS3 games that can be played on the PS4. Not all, though.

Yes, as far as I know with PlayStation Now

Only with the porky PS now as Stream Nativ not