/usr/share/doc/ is in ca-certificates 20170717~16.04.1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/ca-certificates/copyright
/usr/share/doc/ca-certificates/examples/
/usr/share/doc/ca-certificates/examples/ca-certificates-local/
/usr/share/doc/ca-certificates/
/usr/share/doc/ca-certificates/examples/ca-certificates-local/debian/
/usr/share/doc/ca-certificates/examples/ca-certificates-local/debian/ca-certificates-local.triggers
/usr/share/doc/ca-certificates/examples/ca-certificates-local/debian/changelog
/usr/share/doc/ca-certificates/examples/ca-certificates-local/debian/copyright
/usr/share/doc/ca-certificates/examples/ca-certificates-local/debian/control
/usr/share/doc/ca-certificates/examples/ca-certificates-local/debian/rules
/usr/share/doc/ca-certificates/examples/ca-certificates-local/debian/compat
/usr/share/doc/ca-certificates/examples/ca-certificates-local/debian/source/
/usr/share/doc/ca-certificates/examples/ca-certificates-local/debian/source/format
/usr/share/doc/ca-certificates/examples/ca-certificates-local/debian/postrm
/usr/share/doc/ca-certificates/examples/ca-certificates-local/local/
/usr/share/doc/ca-certificates/examples/ca-certificates-local/local/Makefile
/usr/share/doc/ca-certificates/examples/ca-certificates-local/local/Local_Root_CA.crt
/usr/share/doc/ca-certificates/examples/ca-certificates-local/README
/usr/share/doc/ca-certificates/examples/ca-certificates-local/Makefile
/usr/share/doc/ca-certificates/changelog.gz
/usr/share/doc/ca-certificates/README.Debian