helpers: Create helpers with shared files and fs
helpers: Create helpers with shared files and fs

They don't change these objects, so can share them
with parent (will be created slightly faster :) ).

The plan is to make them CLONE_VM, but it's not that
easy.

Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

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