What do new Windows 8/10 attributes mean: No scrub file (X), Integrity (V), Pinned (P), Unpinned (U)

I just opened help for ATTRIB command on Windows 10.0.15063, and found out that there are new attributes I didn't know about.

>attrib /?
Displays or changes file attributes.

ATTRIB [+R | -R] [+A | -A] [+S | -S] [+H | -H] [+O | -O] [+I | -I] [+P | -P] [+U | -U]
       [drive:][path][filename] [/S [/D]] [/L]

  +   Sets an attribute.
  -   Clears an attribute.
  R   Read-only file attribute.
  A   Archive file attribute.
  S   System file attribute.
  H   Hidden file attribute.
  O   Offline attribute.
  I   Not content indexed file attribute.
  X   No scrub file attribute.
  V   Integrity attribute.
  P   Pinned attribute.
  U   Unpinned attribute.
  [drive:][path][filename]
      Specifies a file or files for attrib to process.
  /S  Processes matching files in the current folder
      and all subfolders.
  /D  Processes folders as well.
  /L  Work on the attributes of the Symbolic Link versus
      the target of the Symbolic Link

(specifically, X, V, P, U)

And I can set +X via ATTRIB command, even though it's not listed as modifiable.

I don't know what they do or used for though. And I didn't manage to google out anything useful except lists not much more useful than the help itself. Even Microsoft' own help does not help.