Using Python 3.5+ os.scandir() optimized variant.
Starting.
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*Collecting tree differences
comparing [/home/name/Desktop/mergeall-3.0-beta/test/test2] [/home/name/Desktop/mergeall-3.0-beta/test/test1]
excluding /home/name/Desktop/mergeall-3.0-beta/test/test2/__bkp__
excluding /home/name/Desktop/mergeall-3.0-beta/test/test1/__bkp__
comparing [/home/name/Desktop/mergeall-3.0-beta/test/test2/m1] [/home/name/Desktop/mergeall-3.0-beta/test/test1/m1]
comparing [/home/name/Desktop/mergeall-3.0-beta/test/test2/d3] [/home/name/Desktop/mergeall-3.0-beta/test/test1/d3]
comparing [/home/name/Desktop/mergeall-3.0-beta/test/test2/d2] [/home/name/Desktop/mergeall-3.0-beta/test/test1/d2]
Phase runtime: 0.0005161110002518399
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*Reporting tree differences
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SAMEFILE DIFFERENCES: (name, dirfrom, dirto, why)
**These items will be replaced in dirto by automatic resolution**

[]
-------------------------------------------------------------------------------
UNIQUE ITEMS IN DIRTO: (names, dirfrom, dirto)
**These items will be deleted from dirto by automatic resolution**

[(['.DS_Store', '._.TemporaryItems'],
  '/home/name/Desktop/mergeall-3.0-beta/test/test2',
  '/home/name/Desktop/mergeall-3.0-beta/test/test1'),
 (['.Trashes', '.DS_Store', '.fseventsd'],
  '/home/name/Desktop/mergeall-3.0-beta/test/test2/d3',
  '/home/name/Desktop/mergeall-3.0-beta/test/test1/d3')]
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UNIQUE ITEMS IN DIRFROM: (names, dirfrom, dirto)
**These items will be copied over to dirto by automatic resolution**

[(['Desktop.ini', '$RECYCLE.BIN', '.Trash-1000'],
  '/home/name/Desktop/mergeall-3.0-beta/test/test2',
  '/home/name/Desktop/mergeall-3.0-beta/test/test1'),
 (['desktop.ini', 'Thumbs.db'],
  '/home/name/Desktop/mergeall-3.0-beta/test/test2/d3',
  '/home/name/Desktop/mergeall-3.0-beta/test/test1/d3')]
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MIXED MODE NAMES: (name, dirfrom, dirto)
**These items will be replaced in dirto by automatic resolution**

[]
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*Summary
Compared    => files: 9, folders: 4
Differences => samefile: 0, uniqueto: 5, uniquefrom: 5, mixedmode: 0
Changed:
files   => created: 0, deleted: 0, replaced: 0
folders => created: 0, deleted: 0, replaced: 0
-------------------------------------------------------------------------------
Finished.