/usr/share/luajit-2.1.0-beta3/ is in libluajit-5.1-common 2.1.0~beta3+dfsg-5.1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/luajit-2.1.0-beta3/jit/
/usr/share/luajit-2.1.0-beta3/jit/bc.lua
/usr/share/luajit-2.1.0-beta3/jit/bcsave.lua
/usr/share/luajit-2.1.0-beta3/jit/dis_arm.lua
/usr/share/luajit-2.1.0-beta3/jit/dis_arm64.lua
/usr/share/luajit-2.1.0-beta3/jit/dis_arm64be.lua
/usr/share/luajit-2.1.0-beta3/jit/dis_mips.lua
/usr/share/luajit-2.1.0-beta3/jit/dis_mips64.lua
/usr/share/luajit-2.1.0-beta3/jit/dis_mips64el.lua
/usr/share/luajit-2.1.0-beta3/jit/dis_mipsel.lua
/usr/share/luajit-2.1.0-beta3/jit/dis_ppc.lua
/usr/share/luajit-2.1.0-beta3/jit/dis_x64.lua
/usr/share/luajit-2.1.0-beta3/jit/dis_x86.lua
/usr/share/luajit-2.1.0-beta3/jit/dump.lua
/usr/share/luajit-2.1.0-beta3/jit/p.lua
/usr/share/luajit-2.1.0-beta3/jit/v.lua
/usr/share/luajit-2.1.0-beta3/jit/vmdef.lua
/usr/share/luajit-2.1.0-beta3/jit/zone.lua