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https://academic.oup.com/mnrasl/article/483/1/L80/5195537
For more massive stars, the habitable zone is more distant and habitable zone planets have wider Hill spheres. Large moons can therefore survive on more distant orbits and have larger Hill spheres such that submoons can exist on wider orbits where submoon–moon–planet tidal evolution is far slower, as compared with lower mass stars.
(Yes, the Moon could have had a submoon.)
Amazing! Add some trojan neighbors here and there and it would be a fun place to navigate around. Something like Interplanetary Transport Network, but crunched into a cisplanetary space.