Shared Folder permissions problem

Hi, I have a problem with my CentOS Linux 7 Virtual Machine: I set a shared folder , which is the document root for my vhosts, but I have an issue: only users in group vboxsf can create/modify/delete files in it, even the root user (I tried a touch somefile.txt) was not able to create a file in the path, it gaves me a "protocol error".
I did this command: sudo adduser root vboxsf, and after that, touch command goes and root user created a file somefile.txt in the path, I checked it on the finder of my local machine.
So when i'm browsing a site pointed to the IP of my VM I can access to it, but not create files in the root document, such the cache, if I delete it and go to my site address hosted on VM it doesn't recreate it, or if I get an error log file, it doesn't create the file in the path.
I think the user in this case is apache, or am I wrong?
I tried to do: sudo adduser apache vboxsf, but i still have the problem.
Can someone please help me? thank you.
Have a nice day!