在linux服务器上运行ls命令时，我不明白这条消息错误代码
ls -lisa /srv/storage/homes/srv106/daily/users/avegas/home/daily.36/public_html/sites/
ls: cannot access /srv/storage/homes/srv106/daily/users/avegas/home/daily.36/public_html/sites/default: Permission denied
ls: cannot access /srv/storage/homes/srv106/daily/users/avegas/home/daily.36/public_html/sites/.: Permission denied
ls: cannot access /srv/storage/homes/srv106/daily/users/avegas/home/daily.36/public_html/sites/..: Permission denied
total 0
? ? d????????? ? ? ? ? ? .
? ? d????????? ? ? ? ? ? ..
? ? d????????? ? ? ? ? ? default
父目录有读取权限
ls -lisa /srv/storage/homes/srv106/daily/users/avegas/home/daily.36/public_html/
total 12
303968585 4 drwxr-x--- 3 srv106 srv106 4096 Dec 5 12:13 .
303968566 4 drwx--x--x 3 srv106 srv106 4096 Dec 5 12:13 ..
303969030 4 drw-r--r-- 3 srv106 srv106 4096 Dec 5 12:13 sites