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Description
Low priority issue, follow-up from #78079.
On Windows, os.path.splitroot() produces incorrect results for all of the following paths:
>>> from ntpath import splitroot
>>> splitroot('//./Global/Global/UNC')
('//./Global', '/', 'Global/UNC')
>>> splitroot('//./Global/Z:/')
('//./Global', '/', 'Z:/')
>>> splitroot('//?/Global/Z:/')
('//?/Global', '/', 'Z:/')
>>> splitroot('//./Global/UNC')
('//./Global', '/', 'UNC')
>>> splitroot('//?/Global/UNC/server/share/dir')
('//?/Global', '/', 'UNC/server/share/dir')
>>> splitroot('//?/GLOBALROOT/ContainerMappedDirectories/93AA221C-4061-460F-8C4E-A2EAC1BF3324')
('//?/GLOBALROOT', '/', 'ContainerMappedDirectories/93AA221C-4061-460F-8C4E-A2EAC1BF3324')
>>> splitroot('//?/GLOBALROOT/Device/LanManRedirector/abc/xyz')
('//?/GLOBALROOT', '/', 'Device/LanManRedirector/abc/xyz')
>>> splitroot('//?/GLOBALROOT/Device/Mup/abc/xyz')
('//?/GLOBALROOT', '/', 'Device/Mup/abc/xyz')
>>> splitroot('//?/GLOBALROOT/Device/WebDavRedirector/abc/xyz')
('//?/GLOBALROOT', '/', 'Device/WebDavRedirector/abc/xyz')
>>> splitroot('//?/GLOBALROOT/DosDevices/UNC/abc/xyz')
('//?/GLOBALROOT', '/', 'DosDevices/UNC/abc/xyz')
>>> splitroot('//?/GLOBALROOT/??/UNC/abc/xyz')
('//?/GLOBALROOT', '/', '??/UNC/abc/xyz')