/usr/share/doc/libvirt-doc/examples/xml/nwfilter/no-mac-broadcast.xml is in libvirt-doc 4.0.0-1ubuntu8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | <filter name='no-mac-broadcast' chain='ipv4'>
<!-- drop if destination mac is bcast mac addr. -->
<rule action='drop' direction='out'>
<mac dstmacaddr='ff:ff:ff:ff:ff:ff' />
</rule>
<!-- not doing anything with receiving side ... -->
</filter>
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