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      We have ntfs_is_collation_rule_supported() to check if the collation
      rule you want to use is supported and ntfs_collation() which actually
      collates two data items.  We currently only support COLLATION_BINARY
      and COLLATION_NTOFS_ULONG but support for other collation rules will
      be added as the need arises.
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>