Shared mounted folder on standart user can read-only files

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http://askubuntu.com – I've shared a folder, then logged in to another user and mounted in to ~/Documents. User is Standard, has the group samba. I have tried a lot of permissions with chown, chmod and so on. The user with which i have shared folder (the one, that has mounted that folder onto his ~/Documents) can see all folders, can create files in there and can open files as read only - and that is the problem. I want that user to have possibility to write same documents, not to read-only. When i try to open office file I get this error message: "Document file 'blah blah.odt' is locked for editing by: U (HowTos)