Don't create multiple directory inodes for a single name.
Don't create multiple directory inodes for a single name.

GoogleCloudPlatform/gcsfuse,GoogleCloudPlatform/gcsfuse,jacobsa/ratelimit,BanzaiMan/gcsfuse,kahing/gcsfuse,BanzaiMan/gcsfuse,GoogleCloudPlatform/gcsfuse,mbrukman/gcsfuse,jacobsa/timeutil