/usr/share/man/ is in libsndio-dev 1.1.0-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/man/man3/
/usr/share/man/man3/mio_open.3.gz
/usr/share/man/man3/sio_open.3.gz
/usr/share/man/man3/mio_close.3.gz
/usr/share/man/man3/mio_eof.3.gz
/usr/share/man/man3/mio_nfds.3.gz
/usr/share/man/man3/mio_pollfd.3.gz
/usr/share/man/man3/mio_read.3.gz
/usr/share/man/man3/mio_revents.3.gz
/usr/share/man/man3/mio_write.3.gz
/usr/share/man/man3/sio_close.3.gz
/usr/share/man/man3/sio_eof.3.gz
/usr/share/man/man3/sio_getcap.3.gz
/usr/share/man/man3/sio_getpar.3.gz
/usr/share/man/man3/sio_initpar.3.gz
/usr/share/man/man3/sio_nfds.3.gz
/usr/share/man/man3/sio_onmove.3.gz
/usr/share/man/man3/sio_onvol.3.gz
/usr/share/man/man3/sio_pollfd.3.gz
/usr/share/man/man3/sio_read.3.gz
/usr/share/man/man3/sio_revents.3.gz
/usr/share/man/man3/sio_setpar.3.gz
/usr/share/man/man3/sio_setvol.3.gz
/usr/share/man/man3/sio_start.3.gz
/usr/share/man/man3/sio_stop.3.gz
/usr/share/man/man3/sio_write.3.gz