/usr/share/ is in postgresql-9.5-pgtap 0.95.0-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/postgresql/
/usr/share/postgresql/9.5/
/usr/share/postgresql/9.5/extension/
/usr/share/postgresql/9.5/extension/pgtap--0.90.0--0.91.0.sql
/usr/share/postgresql/9.5/extension/pgtap-core--0.95.0.sql
/usr/share/postgresql/9.5/extension/pgtap--unpackaged--0.91.0.sql
/usr/share/postgresql/9.5/extension/pgtap--0.94.0--0.95.0.sql
/usr/share/postgresql/9.5/extension/pgtap--0.93.0--0.94.0.sql
/usr/share/postgresql/9.5/extension/pgtap--0.91.0--0.92.0.sql
/usr/share/postgresql/9.5/extension/pgtap.control
/usr/share/postgresql/9.5/extension/pgtap-schema--0.95.0.sql
/usr/share/postgresql/9.5/extension/pgtap--0.95.0.sql
/usr/share/postgresql/9.5/extension/pgtap--0.92.0--0.93.0.sql
/usr/share/doc/
/usr/share/doc/postgresql-9.5-pgtap/
/usr/share/doc/postgresql-9.5-pgtap/copyright
/usr/share/doc/postgresql-9.5-pgtap/changelog.Debian.gz