/usr/share/seccomp/policygroups/ubuntu-core/16.04/container-management is in ubuntu-core-security-seccomp 16.04.15.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Description: Can manage containers. This is restricted because it gives wide # access to the system, which is needed for software managing containers. # Usage: reserved # Must use unrestricted because container managers like docker and LXD use # seccomp themselves for container isolation. Since seccomp can only get more # strict and containers may want to have more access than is in the default # policy, use unrestricted seccomp policy. @unrestricted