Is this a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used? Solution: mnt

The `mnt` namespace is a core component of containerization, enabled by default, and does not require special runtime flags for Docker to use it.

The `mnt` namespace is a fundamental Linux kernel namespace used for isolating mount points and is enabled by default, being actively utilized by Docker containers to provide isolated filesystems. Docker containers inherently use their own mount namespaces without requiring explicit daemon configuration to enable this core functionality.