Apple Music Hi-Res Lossless not supported on X200 Pro?

It's surprising that the old "Hi-Fi" setting is missing from sound effects. I am using an external USB DAC that supports Hi-Res audio but sadly the USB audio from the X200 pro tops out at 24bit/48khz. I couldn't find any setting to enable Hi-Res audio, even in Developer Options. Samsung/Apple or pretty much most other brands have seamless switching of bit-rate over USB.