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Yes
What model TV do you have?
What sound system do you have?
When carried over a Dolby Digital Plus carrier signal - yes. Does NOT support it over Dolby True HD like UHD Blu-ray Discs use.
Yes the Apple TV app does.
It supports Dolby Atmos in the Dolby Digital Plus format (which is what all streamers such as Netflix/Disney+/etc. uses).
It does not support the height metadata of Dolby Atmos using TrueHD (such as from blu-rays) but you can still play those tracks as 7.1 surround, just without the height speakers. Typically, I would recommend the Infuse app, which handles all the high definition audio formats really well.