/usr/include/boost/chrono/io/ is in libboost1.65-dev 1.65.1+dfsg-0ubuntu5.
This file is owned by root:root, with mode 0o755.
..
/usr/include/boost/chrono/io/duration_get.hpp
/usr/include/boost/chrono/io/duration_io.hpp
/usr/include/boost/chrono/io/duration_put.hpp
/usr/include/boost/chrono/io/duration_style.hpp
/usr/include/boost/chrono/io/duration_units.hpp
/usr/include/boost/chrono/io/ios_base_state.hpp
/usr/include/boost/chrono/io/time_point_get.hpp
/usr/include/boost/chrono/io/time_point_io.hpp
/usr/include/boost/chrono/io/time_point_put.hpp
/usr/include/boost/chrono/io/time_point_units.hpp
/usr/include/boost/chrono/io/timezone.hpp
/usr/include/boost/chrono/io/utility/
/usr/include/boost/chrono/io/utility/ios_base_state_ptr.hpp
/usr/include/boost/chrono/io/utility/manip_base.hpp
/usr/include/boost/chrono/io/utility/to_string.hpp
/usr/include/boost/chrono/io_v1/chrono_io.hpp