From the NSF ENG Directorate: "The DMP should clearly articulate how 'sharing of primary data' is to be implemented. It should outline rights and obligations of all parties as to their roles and responsibilities in the management and retention of research data. It must also consider changes to roles and responsibilities that will occur should a principal investigator or co-PI leave the institution. Any costs should be explained in the Budget Justification pages."
From the Department of Energy: "The Principal Investigator should determine which data should be the subject of the DMP and, in the DMP, propose which data should be shared and/or preserved in accordance with the requirements."
You may consider using a system like the Open Science Framework (OSF) to manage your project. OSF allows you to manage permissions for various parts of your project. You can also integrate documents from other platforms like Google and GitHub, as well as registering your project and distributing data/results as appropriate.