You won't find many current Apple employees willing to discuss details like this in an open online forum as the policy is very strict on any employee divulging any info about their position and benefits, even at the retail level.
It has been 7 years since I was a retail employee, so this may have changed, but employees had 3 15% friends/family discounts to provide each year. The 15% was off the entire order, including Apple Care. Though, the employees used to be able to get unlimited 25% discounts on Apple Care, so it was smarter to order F/F discounted system without it, and buy Apple Care post purchase if I recall correctly.
Again, this may all be different now, but that is the way it used to be.