I haven't looked at how error messages are generated, if they're not generated
dynamically, I wonder if an error might include an example since the mount
option is not completely intuitive syntax (at least for me. After I found the
correct syntax, only in retrospect I understood)

So, for example
I tried to mount a shared folder in /mnt/ which already had prepared folders,
so caused a potential conflict.

Error was thrown suggesting "nonempty mount option"
Can the following example be appended to this kind of message?

vmhgfs-fuse .host: mountpoint -o nonempty

A possible alternative might be to add an example using a mount option like
above to the other 2 examples displayed by "help"