docker volume permissions (403)

$ tree

├── docker-compose.yml 
├── Dockerfile 
└── www 
    └── index.html

FROM php:5.6-apache
ADD www/ /var/www/html/
EXPOSE 80

version: '2'
services:
  php5_6:
    build: .
    ports :
     - "80:80"
    volumes:
     - ./www:/var/www/html/

$ docker-compose up
[core:error] [pid 17] (13)Permission denied: [client 172.19.0.1:53514] AH00035: access to /index.html denied (filesystem path '/var/www/html/index.html') because search permissions are missing on a component of the path

$ docker exec -it test /bin/bash
# ls -la  
ls: cannot open directory .: Permission denied
# id
uid=0(root) gid=0(root) groups=0(root)
# cd ..
# ls -la
total 4
drwxr-xr-x.  3 root     root   18 Feb 28 17:31 .
drwxr-xr-x. 12 root     root  150 Feb 28 17:59 ..
drwxrwxr-x.  2 www-data 1000 4096 Mar  4 12:22 html