NFS showing Security Contexts "?" / "blank" on Client?

I'm using NFSv4 and used following /etc/exports on Server (lets say, xx.xx.xx.x0):

/var/www/html/project xx.xx.xx.x101(rw)
/var/www/html/project xx.xx.xx.x102(rw)

And each Client is showing something like below, when i check mount:

xx.xx.xx.x0:/var/www/html/project on /var/www/html/project type nfs (rw,vers=4,addr=xx.xx.xx.x0,clientaddr=xx.xx.xx.x101)

But when i check into the mounted directory ls -laZ (with Z option), it is showing like:

drwxrwxrwx. 11 user1   user1 ?   4.0K Mar  9 02:36 .
drwxr-xr-x. 26 user1   user1 ?   4.0K Mar  8 18:17 ..
drwxrwxrwx.  9 user1   user1 ?   4.0K Sep  3  2012 wp-admin
drwxrwxrwx.  8 user1   user1 ?   4.0K Dec 12 09:47 wp-content
drwxrwxrwx.  8 user1   user1 ?   4.0K Oct 16 12:04 wp-includes
-rwxrwxr--.  1 user1   user1 ?    647 Mar  8 18:54 .htaccess
-rwxrwxr--.  1 user1   user1 ?    395 Dec 12 09:49 index.php
-rwxrwxrwx.  1 user1   user1 ?    20K Dec 12 09:49 license.txt
-rwxrwxrwx.  1 user1   user1 ?   9.0K Dec 12 09:49 readme.html

The problems are the ? Question Marks, which i believe is showing wrong File Security Context Values.

Any good idea on it please?

Note: SELinux is disabled, on every machines.

Solution

i got it by myself that i realized SELinux on Clients, was blocking the Security Context Permissions whilst NFS Server is totally disabling the SELinux. So i disable the SELinux on this Client machines and rebooted, then the exactly the same File/Directory Security Contexts are showing on all ends.