This is not a quick answer style question, nor is it ‘a typical’. It aims straight for the heart.
Any interview masks held by your boss are quickly dropped, revealing their true self. This is precisely what you want!
The example given sheds light on their personal values and work priorities. Look for examples demonstrating teamwork, commitment, work quality and an appreciation of individual differences (e.g. a boss centred on the group, not themselves).
This is the feel-good moment we all strive for at work, the intrinsic reward and the one that makes it all worthwhile. Knowing what this might be for your boss provides invaluable insight and a head start for your new job.