shared folder mount writable for all users

[libcha]

Hello,
there is much written about mounting shared folders, but they expect there is only ONE user in the guest system.
I'd like to have shared folder writable for ALL users of the guest system.

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sudo mount -t vboxsf -o umask=0000,uid=1000,gid=1000,exec vbox_shared /media/vbox_shared

results in

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sudo ls -l /media
drwxr-xr-x 1 libcha libcha 4096 zář 9 10:51 vbox_shared

and

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sudo chmod a+w /media/vbox_shared

doesn't help, it is still not WRITEABLE for anybody except root and libcha.

Is there a way to mount it such that all the users of the guest system could write to it ?
Thanks much.