Foe Glass' "owner" canon?

[Eddie]

No: HPFGUIDX 158871

I know there was a long discussion back in August regarding whether
Snape is Dumbledore's man is "proved" or not by his (Snape's)
reflection in the Foe Glass.

My question: is there any canon stating that the Foe Glass shows the
_OWNER'S_ foes?

My follow-up question: since Snape sees himself in the Foe Glass, does
that mean he is his own enemy?  (Certainly consistent with the Snape I
know.)

Thanks,
Eddie