/usr/share/ is in postgresql-9.5-prioritize 1.0.4-1.2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/postgresql-doc-9.5/
/usr/share/postgresql/
/usr/share/postgresql/9.5/
/usr/share/postgresql/9.5/extension/
/usr/share/postgresql/9.5/extension/prioritize.sql
/usr/share/postgresql/9.5/extension/prioritize--1.0.sql
/usr/share/postgresql/9.5/extension/prioritize.control
/usr/share/doc/
/usr/share/doc/postgresql-doc-9.5/extension/
/usr/share/doc/postgresql-doc-9.5/extension/README.md
/usr/share/doc/postgresql-9.5-prioritize/
/usr/share/doc/postgresql-9.5-prioritize/copyright
/usr/share/doc/postgresql-9.5-prioritize/changelog.Debian.gz
/usr/share/doc/postgresql-9.5-prioritize/README.md