All the ones I tried on Apple TV+. I think pretty much all scripted TV these days is produced in at least 5.1 surround, which is what it needs (also supports 7.1). But it has to be supported by the content and the app you use.

LifeHacker put out a guide a few hours ago about which streaming services support it on their iOS app [1], the upshot being:

Supported: Apple TV+, Disney+, HBO Max

Not yet supported: Netflix, Prime Video, Showtime Anytime, PBS, TNT

[1] https://lifehacker.com/which-apple-devices-and-video-service...