os.path.samefile fails on windows network drive

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2017-09-14.12:12:08.965>
labels = ['type-bug', 'OS-windows']
title = 'os.path.samefile fails on windows network drive'
updated_at = <Date 2017-09-14.12:12:08.965>
user = 'https://bugs.python.org/DanielSauer'

bugs.python.org fields:

activity = <Date 2017-09-14.12:12:08.965>
actor = 'Daniel Sauer'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Windows']
creation = <Date 2017-09-14.12:12:08.965>
creator = 'Daniel Sauer'
dependencies = []
files = []
hgrepos = []
issue_num = 31468
keywords = []
message_count = 1.0
messages = ['302170']
nosy_count = 5.0
nosy_names = ['paul.moore', 'tim.golden', 'zach.ware', 'steve.dower', 'Daniel Sauer']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue31468'
versions = ['Python 3.5']