direitos de acesso dependendo da montagem

Question

Não consigo acessar um diretório e não entendo o porquê:

O usuário 'exchange' está no grupo da direita e pode acessar na pasta não montada application1_exchange_test mas não na application1_exchange. A única diferença é que application1_exchange é uma montagem nfs.

root@application2-dev:/var/spool/application1_exchange/from# namei -mo 'pwd'
f: /var/spool/application1_exchange/from
 drwxr-xr-x root    root    /
 drwxr-xr-x root    root    var
 drwxr-xr-x root    root    spool
 drwxrwx--- tomcat8 tomcat8 application1_exchange
 drwxrwxr-x tomcat8 tomcat8 from

root@application2-dev:/var/spool/application1_exchange/from# su exchange

exchange@application2-dev:/var/spool/application1_exchange/from$ groups 
exchange tomcat8

exchange@application2-dev:/var/spool/application1_exchange/from$ ls -ld . .. ../..
ls: cannot access '../..': Permission denied
drwxrwxr-x  3 tomcat8 tomcat8 4096 Jun 21 07:31 .
drwxrwx--- 11 tomcat8 tomcat8 4096 Jun 21 07:31 ..

exchange@application2-dev:/var/spool/application1_exchange/from$ cd /var/spool/application1_exchange
bash: cd: /var/spool/application1_exchange: Permission denied

exchange@application2-dev:/var/spool/application1_exchange/from$ cd /var/spool/

exchange@application2-dev:/var/spool$ ls -dl application1_exchange*
drwxrwx--- 11 tomcat8 tomcat8 4096 Jun 21 07:31 application1_exchange
drwxrwx---  3 tomcat8 tomcat8 4096 Jul  9 11:08 application1_exchange_test

exchange@application2-dev:/var/spool$ ls -l application1_exchange*
ls: cannot open directory 'application1_exchange': Permission denied
application1_exchange_test:
total 4
drwxr-xr-x 3 tomcat8 tomcat8 4096 Jul  9 11:08 from

exchange@application2-dev:/var/spool$ findmnt /var/spool/application1_exchange
TARGET                       SOURCE                     FSTYPE OPTIONS
/var/spool/application1_exchange 192.168.1.1:/mnt/exchange nfs    rw,relatime,sync,vers=3,rsize=262144,wsize=262144,namlen=255,hard,proto=tcp,timeo=600,

A propriedade do diretório não montado não desempenha nenhum papel. Foi raiz, mas também com tomcat8 é o mesmo. As opções nfsd / export são rw, no_root_squash, sync, no_subtree_check