Some (not all) DVD-A discs come with a stereo high resolution track. This is usually 24-bit 96 kHz stereo. If the DVD-A disc does not have a high-res stereo track, you will only be listening to the DD compressed stereo track.
BTW, not to diss your MSB, but I would hope it could handle a 96 kHz signal, hell my nearly 8-year old 2nd gen Sony DVD player has 24-bit 96 kHz DACs.