docker is not allowing to mount a directory into a drupal container -

i doing simple puting drupal in docker container

volumes:    - /c/users/mark/drupalb/sites/all/modules:/var/www/html/sites/all/modules 

this directive should mount home directory of modules containers module directory doesnt work seems thing people everyday how resolves

not clear problem is. in meantime here's working drupal example

example

the folowing compose file

└── docker-compose.yml 

runs 2 containers, 1 drupal other db:

$ docker volume create --name drupal_sites $ docker-compose -d $ docker-compose ps        name                     command             state          ports          -------------------------------------------------------------------------------- dockercompose_db_1    docker-entrypoint.sh mysqld        3306/tcp              dockercompose_web_1   apache2-foreground                 0.0.0.0:8080->80/tcp  

note how volume used store drupal sites created separately, defaults local storage can something more exotic fit needs

docker-compose.yml

version: '2' services:   db:     image: mysql     environment:       - mysql_root_password=letmein       - mysql_database=drupal       - mysql_user=drupal       - mysql_password=drupal     volumes:       - /var/lib/mysql   web:     image: drupal     depends_on:       - db     ports:       - "8080:80"     volumes:       - drupal_sites:/var/www/html/sites       - /var/www/private volumes:   drupal_sites:     external: true