How to make an NTFS Shared Volume Writable
NTFS is a disk file system. Usually you may access NTFS only by directly attached devices (e.g. PATA, SATA, SCSI etc.)

If you connect to a share over the network you use a distributed file system or network file system. They do not share block level access to the same storage but use a network protocol (e.g. AFP, SMB, NFS etc.).

Since the NTFS volume is attached to the MacMini, you won't be able to mount it via fstab or mount_ntfs on your MacBook Pro.

Instead check the permissions / ACLs in the file sharing settings in Windows 8.