apple tv 4 passthrough

Hi,
can’t find any infos about this…can anyone help me?

is the DD/DTS passthrough is working fine with the apple tv 4?

…and one more question since atv4 hasn’t the optical output: can the passthrough work using the spidf output of the tv [atv4 -> hdmi -> tv -> spidf -> avr ] ?

thank you so much