jcmd uses src/jdk.internal.jvmstat/linux/classes/sun/jvmstat/PlatformSupportImpl.java to scan for all temporary directories: the host temp dir, and (through the /proc filesystem) the temp dirs of running containers.

It checks the inode value to ensure a temp directory under /proc is not the same as the host temp directory.
However the inode can have the same value in the container and host. Thus we should check device id additionally.