Black is Black...this foal is Black.
The deep bright Blacks are often going to go Grey (if there is a Grey parent, that is)
Grey seems to concentrate the colours, in a foal, so a Chestnut is affected the same way- a bright, bright Chestnut, with a Grey parent, will 99% of the time go Grey.
Fading/non Fading, it makes no difference to the foal colour, and is not yet testable.
"Dominant Black" does not exist, Black cannot hide Agouti, Agouti shows on Black.
A word on Smoky Black (Black + Cream).
Even though it does not really show, and a true Black horse can carry Cream, in Minis, Cream does seem to step outside the rulebook, as it were.
Thus a Black foal, in Minis, can sometimes "show" Cream.
This does NOT mean all "off Black" foals carry Cream, it is merely an observation for people more used to "Big Horse" colours and effects!!