overlayfs: DAC override capability for ovl_lookup_real(lowerdir)?

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Hi! The problem is:
if lower directory contains subdirectory foo with permissions 0700 root.root,
upper directory contains same subdirectory with permissions 0700 user.user,
user can't create files in unioned one (EACCES error).
May be ovl_lookup_real for lowerdir need to have DAC_READ_SEARCH capability?
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