Correct me if I'm wrong but isn't NTFS a windows file system and Mac OS has its own file system? I am VERY limited in my Mac knowledge though. I know MACs can read NTFS drives but you are saying you are moving the data to a new share on the Mac. This means you will lose the NTFS security naturally because the Mac server won't have any NTFS drives in it...unless of course you have installed one?
As for time stamps I don't think you can change these...timestamps are timestamps and are there for a reason. usually the main timestamp people want to keep intact is "date modified". Have you even tested this with one file moving it to the Mac? I have just tested it now moving a file between two pc's on NTFS drives and the date modified wwasn't changed. "date created" and "last time accessed" were though. I cant vouch for the same happening on a Mac however as i dont have one!
If the timestamps could be modified then they could be abused.