/usr/lib/prosody/modules/ is in prosody 0.9.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/prosody/modules/adhoc/
/usr/lib/prosody/modules/adhoc/adhoc.lib.lua
/usr/lib/prosody/modules/adhoc/mod_adhoc.lua
/usr/lib/prosody/modules/mod_admin_adhoc.lua
/usr/lib/prosody/modules/mod_admin_telnet.lua
/usr/lib/prosody/modules/mod_announce.lua
/usr/lib/prosody/modules/mod_auth_anonymous.lua
/usr/lib/prosody/modules/mod_auth_cyrus.lua
/usr/lib/prosody/modules/mod_auth_internal_hashed.lua
/usr/lib/prosody/modules/mod_auth_internal_plain.lua
/usr/lib/prosody/modules/mod_bosh.lua
/usr/lib/prosody/modules/mod_c2s.lua
/usr/lib/prosody/modules/mod_component.lua
/usr/lib/prosody/modules/mod_compression.lua
/usr/lib/prosody/modules/mod_dialback.lua
/usr/lib/prosody/modules/mod_disco.lua
/usr/lib/prosody/modules/mod_groups.lua
/usr/lib/prosody/modules/mod_http.lua
/usr/lib/prosody/modules/mod_http_errors.lua
/usr/lib/prosody/modules/mod_http_files.lua
/usr/lib/prosody/modules/mod_iq.lua
/usr/lib/prosody/modules/mod_lastactivity.lua
/usr/lib/prosody/modules/mod_legacyauth.lua
/usr/lib/prosody/modules/mod_message.lua
/usr/lib/prosody/modules/mod_motd.lua
/usr/lib/prosody/modules/mod_net_multiplex.lua
/usr/lib/prosody/modules/mod_offline.lua
/usr/lib/prosody/modules/mod_pep.lua
/usr/lib/prosody/modules/mod_ping.lua
/usr/lib/prosody/modules/mod_posix.lua
/usr/lib/prosody/modules/mod_presence.lua
/usr/lib/prosody/modules/mod_privacy.lua
/usr/lib/prosody/modules/mod_private.lua
/usr/lib/prosody/modules/mod_proxy65.lua
/usr/lib/prosody/modules/mod_pubsub.lua
/usr/lib/prosody/modules/mod_register.lua
/usr/lib/prosody/modules/mod_roster.lua
/usr/lib/prosody/modules/mod_s2s/
/usr/lib/prosody/modules/mod_s2s/mod_s2s.lua
/usr/lib/prosody/modules/mod_s2s/s2sout.lib.lua
/usr/lib/prosody/modules/mod_saslauth.lua
/usr/lib/prosody/modules/mod_storage_internal.lua
/usr/lib/prosody/modules/mod_storage_none.lua
/usr/lib/prosody/modules/mod_storage_sql.lua
/usr/lib/prosody/modules/mod_time.lua
/usr/lib/prosody/modules/mod_tls.lua
/usr/lib/prosody/modules/mod_uptime.lua
/usr/lib/prosody/modules/mod_vcard.lua
/usr/lib/prosody/modules/mod_version.lua
/usr/lib/prosody/modules/mod_watchregistrations.lua
/usr/lib/prosody/modules/mod_welcome.lua
/usr/lib/prosody/modules/muc/
/usr/lib/prosody/modules/muc/mod_muc.lua
/usr/lib/prosody/modules/muc/muc.lib.lua
/usr/lib/prosody/modules/sql.lib.lua
/usr/lib/prosody/modules/storage/
/usr/lib/prosody/modules/storage/mod_xep0227.lua
/usr/lib/prosody/modules/storage/sqlbasic.lib.lua
/usr/lib/prosody/modules/storage/xep227store.lib.lua