@metin - since the "generally accepted" audio range is 20Hz to 20kHz then the extended output above 20kHz would not be in the audible range of humans.
Only young people can hear 17-18 kHz and even 20kHz is beyond their capability
Tannoy has a super tweeter that goes up that high and they claim to be able to hear the "impact" of frequencies that high.
Since most musical instruments tops out around 14-15 kHz - like cymbals - then (for me) anything above that is superfluous, so I do not worry about it.
Since it's only the very best Phono stages would be able to process higher frequencies, I would have to guess that the Schiit product would not be able to reproduce those frequencies.
Maybe you should contact Schiit - they could give you a definitive answer
Regards - Steve