Nap/quiet time is mandatory at my daycare as well. All children must lay in their bed no matter what their age, but I don't have school age children, so up to age 4. Sometimes as they reach JK age they aren't falling asleep right away and will lay there for 1/2 an hour or so before falling asleep playing with a cuddle or singing quietly to themselves, I've had that happen. But they all fall asleep.

However, if I ever had a client like yours asking you to cut out naps I would still follow my procedure but I would tell the parent that they had a shorter nap than the others which would still be the truth. But I wouldn't give the total hours and minutes to the parent.

I've had a lot of parents tell me that their children don't nap at home or go to bed well at night but they all sleep well at naptime. Maybe because all their friends are doing the same thing? Maybe because they know how the routine goes daily?