simple idea that to improve the blender sculp.

I dont see this option in blender sculpt.
The idea is something like mask by separated meshes.
An object can have separate meshes, so i can be possible to
mask by separated meshes.
I have attached an example.I really need this option

Also, would be a nice idea put the mask modifier compatible in sculpt mode.
I hope some Blender developers see this post.

thanks for your attention.