(If you have had experience:)
I’ve supervised highly credentialed professionals in (one/several) of my jobs, specifically _________________. The work I was required to supervise and evaluate was very specialized. In many cases, I learned from them as the work progressed. It is very stimulating to work with highly educated people.
(If you have had no such experience, but you don’t want to rule out your potential ability in that area:)
To date, my work has not required me to supervise people with advanced degrees. I do have experience working with people who hold graduate degrees in ______________________________ (engineering/law/ accounting/science/psychology) and have acquired through association with them much knowledge about their work. I would be very comfortable supervising post doctorate professionals. I am confident we could develop a relationship of mutual respect. I would always respect their greater knowledge of specific areas of the work; but I think they would come to respect me for my evenhanded and broad-based management skill.