Hey, sorry for the late response. I just ran:

  import datetime
  from dateutil.zoneinfo import get_zonefile_instance
  import dateutil.tz

  zonenames = list(get_zonefile_instance().zones)

  for tz in zonenames:
      tz = dateutil.tz.gettz(tz)
      for i in range(86400):
          if datetime.datetime.fromtimestamp(i, tz).fold == 1:
              print(str(tz))

tz uses your OS's zone info so also posting my distro version:
Debian 8.8 - 3.16.0-4-amd64 #1 SMP Debian 3.16.43-2 (2017-04-30) x86_64 GNU/Linux

And I got the same result, no timezone with folds in these range.