TimeMachine using Samba and Avahi

device-info.service

<?xml version="1.0" standalone='no'?><!--*-nxml-*-->
<!DOCTYPE service-group SYSTEM "avahi-service.dtd">
<service-group>
  <name replace-wildcards="yes">%h</name>
  <service>
     <type>_device-info._tcp</type>
     <port>0</port>
     <txt-record>model=Xserve</txt-record>
  </service>
</service-group>

enable-timemachine.sh

sudo defaults write com.apple.systempreferences TMShowUnsupportedNetworkVolumes 1

smb.conf

[global]

#   :
# omitted
#   :

############ Custom Config ############
client min protocol = SMB3
client max protocol = SMB3
mangled names = no
ea support = yes
vfs objects = catia fruit streams_xattr
fruit:resource = xattr
fruit:metadata = stream

#   :
# omitted
#   :

[TimeMachine]
comment = TimeMachine
path = /PATH_TO_YOUR_TIME_MACHINE_VOLUME
writable = Yes
browsable = Yes
guest ok = No
fruit:time machine = yes
fruit:time machine max size = 1T

smb.service

<?xml version="1.0" standalone='no'?><!--*-nxml-*-->
<!DOCTYPE service-group SYSTEM "avahi-service.dtd">
<service-group>
  <name replace-wildcards="yes">%h</name>
  <service>
    <type>_smb._tcp</type>
    <port>445</port>
  </service>
</service-group>