public static String shellMountMaster() {
      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
        return "su --mount-master";
      }
      return "su";
    }
Constructs a shell command to start a su shell connected to mount master daemon, to perform public mounts on
Android 4.3+ (or 4.2+ in SELinux enforcing mode)

@return Shell command
imitate/src/main/java/com/engineer/imitate/shell/Shell.java