PurePath.root 
A string representing the (local or global) root, if any:
>>> PureWindowsPath('c:/Program Files/').root
'\\'
>>> PureWindowsPath('c:Program Files/').root
''
>>> PurePosixPath('/etc').root
'/'
UNC shares always have a root:
>>> PureWindowsPath('//host/share').root
'\\'
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