df output:

$ df --version
df (GNU coreutils) 8.30
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by Torbjorn Granlund, David MacKenzie, and Paul Eggert.
$ df -kP /run/xo-server/mounts/cbb36e4c-3353-4126-8588-18ba25697403
Filesystem                  1024-blocks  Used    Available Capacity Mounted on
xx.xxx.xxx.xx:/xxxxxxxxxxx 198640150528 43008 198640107520       1% /run/xo-server/mounts/cbb36e4c-3353-4126-8588-18ba25697403

This module result:

{
  filesystem: '10.190.111.25:/backupdrive 1',
  size: 101007514140672,
  used: 44040192,
  available: 203407470100480,
  capacity: 0.01,
  mountpoint: '/run/xo-server/mounts/cbb36e4c-3353-4126-8588-18ba25697403'
}

Dump boundaries: [ 28, 11, 6, 13, 9, -1 ]

Dump cl:

[
  '10.190.111.25:/backupdrive 1',
  '98640150528',
  '43008',
  '198640107520',
  '1%',
  '/run/xo-server/mounts/cbb36e4c-3353-4126-8588-18ba25697403'
]

The size field appears to be missing the first character.