simple idea that to improve the blender sculp.

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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.