For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Cic17:External/openSUSE_Tumbleweed/home:Cic17:External.repo
zypper refresh
zypper install btrfs-assistant
For openSUSE Slowroll run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Cic17:External/openSUSE_Slowroll/home:Cic17:External.repo
zypper refresh
zypper install btrfs-assistant
For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Cic17:External/16.0/home:Cic17:External.repo
zypper refresh
zypper install btrfs-assistant